I'd say so.  I just loaded up on a bunch at the outlet in Vegas and normally wear size 6-8 depending on the brand, and most of the size small fits me fine.  They carry some different jean brands though, and sometimes I'm a medium in those, but that's normal for jeans to fit weird like they do when we're not pregnant!  Don't even escape that when looking for mat clothes!
Today, Old Navy is one of the largest clothing companies around the globe, and its maternity clothes are a perfect extension of the styles and ideas this trendy brand has long embraced. Old Navy for Maternity proudly sets itself apart from other maternity clothes companies in a few key ways. While Gap – Maternity and Motherhood offer classic clothes at premium price points, Old Navy for Maternity champions current fashions at affordable prices. With casual, professional, and special occasion options, Old Navy has all of your maternity clothes needs covered. 
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